Abstract

This paper discusses the hobbing of gears made of austempered spheroidal graphite cast iron, which has become an object of attention recently as a new material for gears. This iron has many advantages, such as the properties of a cast material and a high strength equivalent to that of steels, and is also an economical material. However, this cast iron is hobbed before heat treatment at present, for the hobbing of teeth of a hardened gear blank is considered to be very difficult. Yet, if the cutting of a hardened gear blank is possible, the cost will be lower because the gear can be used without performing a finishing operation on the tooth surface removing the distortion from heat treatment. In this study, a basic test was conducted using a TiN - coated fly-tool having the same form as one blade of a hob. Next, a hobbing test was conducted using a TiN-toated hob with a large clearance angle of 15°. As a result, the following conclusions were obtdined : ( 1 ) A groove length of only 3.75 meters can be achieved for the work by a (TiN- coated) fly-tool with a clearance angle of 12°. ( 2 )A (TiN- coated) hob with a clearance angle of 15°can apply to ADI. ( 3 ) The accuracy of the tooth profile and the tooth trace of a hobbed ADI gear correspond to the JIS 1 st and 4 th grades. respectively.

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